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E. STAHLBRODT.

Lathe Rest.

No. 77,672. Patented May 5,1868.

N. PETERS. Phuiwlilhagrlpher. Walhinflom D. C

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Le t r Pa ent No 77,672,;lated M g 1868.

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TO ALL WHOM IT MAY CONCERN:

Be it known that I, EDWARD Srannenonr, of Rochester, county of Monroe,and State of New York, have invented a new and useful Improvement onLathes; and I do hereby declare that 'the following is a full and exactdescription thereof, reference being had to the accompanying drawings,and to the letters of reference marked thereon. a

Figure 1 represents a perspective view of a-lathe with my improvementthereon.

Figure 2 represents a side view of my improvement, showing theshear-knot i a closed.

Figure 3 represents a transverse section of shear-knot z i drawn open,also the swivel h.

The nature of my invention consists in providing the apron or aprons'ofany lathe with a slot for the pnrpose of moving the carriage of anylathe either way, as may be required, the length of 'the'slo't, withoutopening the shear-knot.

Great difliculty has been experienced in replacing a chisel on the lathewhen cutting screws, if from course of accident or nec'essity the chiselhas to be taken out before the whole length of the screw is out. It isalmost impossible to bring the point of the newly inserted chisel in thesame place where the chisel taken out had left off, In all la'thes nowin us'e,the shear-fkno.t has to be ope ned in orderto move the carriagetothegdesired point, but when the proper place is found, the shear-knotmay not exactly fit in the grooves of the screw which moves thecarriage;

To enable others skilled in the art to make or use'my invention, I willproceed to describe the construction and operation of the same.

1 cute. slot (marked 6 b in drawing) in the apron or aprons B ofwanylathe. I Through this slot 6 6 passes a hollow screw, cl, and inside ofthe hollowscrew-d ista rod, 0, extending beyond either end of screw a,both working independent of each other. The hollow screwcl is made solidto the frame or slid'eff of the shear-knot z'z'on the inside of apron B,and is provided with a knot, g on the outside of apron B. The rod cprojects beyond the hollow screw d. One end of the rod 0 is made solidto the swivel h on the inside of apron B, and theopposite end of rod 0,on the outside of apron B, is provided witha lever at handle e. i

The rod 0 attached to swivel k, with lever lon the extreme end, is forthe purpose of opening or closing the shear-knot By loosening the'knot gthe carriage A can be' n roved either way the length of the slot bib,and the point of chisel can easily be brought to the proper place, andwithout disturbing the shear-knot 2' 2, and as soon as the chisel isbrought in it's' proper position the knotg istobe tightened, and thelathe may be set to work.

What I- claim as'my invention, and desire to secure by Letters Patent,is-

The combination of slotted apron B, knotg, screw d, platef, andtool-carriage A, when constructed and arranged substantially asdescribed.

' EDWARD STAHLBRODT.

Witnesses Gnonen FRAUENBERGER, Geo. Ercnonw;

